CH A P T E R
8
Troubleshooting Cisco 1800 Series Routers
(Modular)
If you encounter problems with your Cisco 1800 series integrated services router (ISR) (modular), the
information in this chapter can help you isolate problems in the router or eliminate the router as the
source of the problem.
This chapter contains the following sections:
Note
•
Problem Solving, page 8-1
•
Reading LEDs, page 8-4
•
System Messages, page 8-5
•
Recovering a Lost Password, page 8-6
•
More Troubleshooting Help, page 8-6
To troubleshoot interface cards, see Overview of Cisco Interface Cards for Cisco Access Routers.
If you cannot locate the source of the problem, contact a Cisco customer service representative for
information on how to proceed. For technical support information, see the “Obtaining Documentation
and Submitting a Service Request” section on page 1-15. Before you call, have the following
information ready:
•
Chassis type and serial number
•
Maintenance agreement or warranty information
•
Type of software and version number
•
Date you received the router
•
Brief description of the problem
•
Brief explanation of the steps you have taken to isolate the problem
Problem Solving
The key to problem solving is to isolate the problem to a specific subsystem by comparing what the
router is doing to what it should be doing.
The LEDs on the router aid you in determining router performance and operation. The LEDs are
described in the “Reading LEDs” section on page 8-4.
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Problem Solving
When solving problems, consider the following router subsystems:
•
Power and cooling systems—External power source, power cable, router power supply, circuit
breaker, and router fan. Also check for inadequate ventilation or air circulation.
•
Interface cards—LEDs on the interface cards help identify a failure.
•
Cables—External cables that connect the router to the network.
Troubleshooting the Power and Cooling Systems
Both the system LED and the fans can help you troubleshoot a power problem. Check the following
items to help isolate the problem:
Normal Indications
With the power switch on, the normal indications are:
•
SYS PWR LED on green and continuous
•
Fan operating
Fault Indications
Check the following symptoms to locate or eliminate faults in the power and cooling systems:
•
With the power switch on, is the SYS PWR LED on?
– If the LED is green and continuous, the router is receiving power and is functional.
– If the LED is off, check the power source and power cable.
•
With the power switch on and the SYS PWR LED on and green, does the fan operate?
– If no, check the fan.
– If yes, the power system is functioning.
•
With the power switch on and the SYS PWR LED off, does the fan operate?
– If yes, the router is receiving power. The fan is connected directly to the DC outputs of the power
supply.
– If no, check the power source and power cable.
•
Does the router shut down after being on a short time?
– Check for an environmentally induced shutdown. See the next section, “Environmental
Reporting Features, page 8-3.”
– Check the environmental site requirements in the “General Site Requirements” section on
page 3-3.
– Check for a power supply failure by inspecting the SYS PWR LED on the front panel. If it is
green, the power supply is functional.
•
Router partially boots, but LEDs do not go on.
– Check for a power supply failure by inspecting the SYS PWR LED on the front panel of the
router. If the SYS PWR LED is blinking or continuously green, the power supply is functional.
– If the SYS PWR LED is not on, see “Cisco One-Year Limited Hardware Warranty Terms”
section on page 1-14.
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Problem Solving
Environmental Reporting Features
If the router is operating at an abnormally high temperature, consider the following causes:
•
Fan failure
•
Air conditioner failure in the room
•
Air blockage to cooling vents
Take steps to correct the problem. See the “Site Environment” section on page 3-4.
Troubleshooting Cables, Connections, and Interface Cards
Network problems can be caused by cables, cable connections, or interface cards, or by external devices
such as a modem, transceiver, hub, wall jack, WAN interface, or terminal. Check for the following
symptoms to help isolate the problem.
•
Card is not recognized by the router.
– Make sure that the card is firmly seated in its slot.
– Check the LEDs on the card. Each card has its own set of LEDs.
– Make sure that you have a version of Cisco IOS software that supports the card.
•
Card is recognized, but interface ports do not initialize.
– Make sure that the card is firmly seated in its slot.
– Check external cable connections.
– Make sure that you have a version of Cisco IOS software that supports the card. Check the
software requirements for the affected card, which can be found in the configuration note for
the card.
•
Router does not boot properly, or constantly or intermittently reboots.
– Make sure that the card is firmly seated in its slot.
– Check the router chassis or software.
•
Router boots, but the console screen is frozen.
– Check the external console connection.
– Verify that the parameters for your terminal are set as follows:
(a) The same data rate as configured for the router (9600 baud is the default)
(b) 8 data bits
(c) 1 stop bit
(d) No parity generated or checked
•
Router powers on and boots only when a particular card is removed.
– Check the card. See the “Cisco One-Year Limited Hardware Warranty Terms” section on
page 1-14 and the “Obtaining Documentation and Submitting a Service Request” section on
page 15 of the “Introduction to Cisco 1800 Series Routers (Modular) Hardware
Documentation” document for warranty and customer service contact information.
•
Router powers on and boots only when a particular cable is disconnected.
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Reading LEDs
– There may be a problem with the card or cable. See the “Cisco One-Year Limited Hardware
Warranty Terms” and the “Obtaining Documentation and Submitting a Service Request”
sections of the “Introduction to Cisco 1800 Series Routers (Modular) Hardware
Documentation” document for warranty and customer service contact information.
Reading LEDs
The LEDs on the router enable you to determine router performance and operation. The System Power
(SYS PWR) LED and the System Activity (SYS ACT) LED are on the front panel; all the other LEDs
are on the back panel.
Table 8-1
LED Indicators on Cisco 1800 Series Routers
LED Indicator
State
Meaning
Possible Causes and Corrective
Actions
SYS PWR
Off
No output is coming from the
internal power supply.
Power is not switched on at the
router.
Power is not available from the
source.
Faulty input power wires or
connections are missing.
Failed power supply in the router. To
replace the internal power supply,
call your Cisco technical support
representative.
SYS ACT
Solid green
Router is receiving power, and Normal indication. No action is
the internal power supply is
required.
functional.
Blinking
green
During bootup, router is
booting up normally.
Normal indication. No action is
required.
After bootup, router is
operating in ROM monitor
mode.
See the router rebooting and
ROM monitor information in the
Cisco 1800 series software
configuration documentation.
No packet transfers are
occurring.
Interface card connections are not
functional.
Off
Router is not configured properly.
Check configuration, and make
corrections as necessary.
Blinking
System is actively transferring Normal indication. No action is
packets and monitoring
required.
internal activity
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System Messages
Table 8-1
LED Indicator
LED Indicators on Cisco 1800 Series Routers (continued)
State
CF
Off
(CompactFlash
Busy)
Blinking
green
Meaning
Possible Causes and Corrective
Actions
The CompactFlash memory
card is not being accessed.
Normal indication. No action is
required. It is okay to remove the
CompactFlash memory card if the
CF LED remains off.
The CompactFlash memory
card is being accessed.
Normal indication. No action is
required.
Caution
FDX
100
Link
Do not remove the
CompactFlash memory
card while it is being
accessed.
Off
Fast Ethernet port next to the
LED is operating in
half-duplex mode.
Indication is for information only.
Solid green
Fast Ethernet port next to the Indication is for information only.
LED is operating in full-duplex
mode.
Off
Fast Ethernet port next to the
LED is operating at 10 Mbps.
Solid green
Fast Ethernet port next to the Indication is for information only.
LED is operating at 100 Mbps.
Off
Fast Ethernet link is not
Ethernet is not active or is not
established at the Ethernet port connected. Check Ethernet
next to the LED.
connections.
Indication is for information only.
Router is not configured properly.
Check configuration, and make
corrections as necessary.
Solid green
FastEthernet link is established Normal indication. No action is
at the Ethernet port next to the required.
LED.
AIM
Off
No AIM is installed.
Indication is for information only.
(Advanced
integration
module)
Solid green
AIM is recognized by the
router and is initialized.
Normal indication. No action is
required.
System Messages
This section describes system error and recovery messages that may appear when a Cisco 1800 series
router is operated. The Cisco IOS software displays system error and recovery messages on an external
device console terminal screen. (For more information, see the “Connecting to the Console Port” section
on page 6-4.)
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Recovering a Lost Password
The terminal should display one of the following prompts:
Router>
(indicates the user EXEC command mode)
or
Router#
(indicates the privileged EXEC command mode)
The Cisco IOS software checks the system condition once every 30 seconds. If a condition still exists,
the error message is displayed again; if the error condition has cleared, a recovery message is displayed.
Table 8-2 describes some of the most common system error and recovery messages.
Table 8-2
System Messages
Error Message
Explanantion
%ENVMON-3-FAN_OK: Fan <fan-number>
functional now
The cooling fan within the chassis is working.
%ENVMON-3-FAN_FAIL: Fan <fan-number> is The cooling fan within the chassis is not working.
malfunctioning
%CFG-3-CARD_NOT_SUPPORTED: Slot <n>.
<Card identification from cookie, including at
least card type, version, revision, and serial
number>
The card found is not recognized or is not
supported in the specified slot.
%CFG-6-UNKNOWN_AIM: AIM module in
This Cisco IOS image does not have the driver
AIM slot <n> is not supported by this IOS image. code for the AIM discovered in AIM slot.
Card info: <all TLV PEP data from cookie>
Recovering a Lost Password
You can recover a lost enable password, but an enable secret password is encrypted and is not
recoverable. If you lose an enable secret password that is configured on your router, you can replace it
with a new enable secret password.
For password recovery and replacement procedures, see the Password Recovery Procedures.
More Troubleshooting Help
For online troubleshooting help, go to the TAC Case Collection Tool and Troubleshooting Assistant.
You must have an account on Cisco.com. If you do not have an account or have forgotten your username
or password, click Cancel at the login dialog box and follow the instructions that appear.
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